Ubuntu mySQL Setting for remote access

1) Verify if is listenning
$wget --verbose http://localhost:3306
$wget --verbose http://192.168.0.12:3306
or
$nmap -sV localhost
$nmap -sV 192.168.0.12
or
$sudo netstat -tulpn
or
$sudo iptables -L -n

2) Verify file /etc/mysql/conf.d/  #include other possibles files
$sudo vi /etc/mysql/mysql.conf.d/mysqld.cnf  #edit file and comment next line, or
$sudo gedit /etc/mysql/mysql.conf.d/mysqld.cnf

#bind-address        = 127.0.0.1

3) Add user


mysql>select user, host, authentication_string from mysql.user;

mysql>SHOW GRANTS FOR 'onepoint'@'%'; #if not exist

mysql> CREATE USER 'onepoint'@'localhost' IDENTIFIED BY 'password';
mysql> GRANT ALL PRIVILEGES ON Maxx2018.* TO 'onepoint'@'localhost' WITH GRANT OPTION;

mysql>CREATE USER 'onepoint'@'%' IDENTIFIED BY 'password';
mysql>GRANT ALL PRIVILEGES ON *.* TO 'onepoint'@'%' WITH GRANT OPTION;
mysql>GRANT ALL PRIVILEGES ON *.* TO 'onepoint'@'%' IDENTIFIED BY 'password' WITH GRANT OPTION;
mysql>FLUSH PRIVILEGES;

4) Update user

mysql>use mysql;
mysql>update user set password=PASSWORD("NEWPASSWORD") where User='root'; 
mysql>flush privileges;


5) Common Errors


ERROR 1820 (HY000): You must reset your password using ALTER USER statement before executing this statement.


ALTER USER 'root'@'localhost' IDENTIFIED BY 'MyNewPass'


ERROR 1819 (HY000): Your password does not satisfy the current policy requirements

SET GLOBAL validate_password_policy=LOW;

You can edir /etc/mysql/my.cnf, but then you will have a security risk!
in [mysqld] add:

validate_password_policy=LOW

References:
[1] Firewall ubuntu https://stackoverflow.com/questions/30251889/how-to-open-some-ports-on-ubuntu
[2] https://stackoverflow.com/questions/14779104/how-to-allow-remote-connection-to-mysql

Fedora 29 mySQL

$sudo dnf install https://dev.mysql.com/get/mysql80-community-release-fc29-1.noarch.rpm

$sudo dnf --disablerepo=mysql80-community --enablerepo=mysql57-community install mysql-community-server


works too for Fedora 23 (Server Edition)

Problems
$ mysql -u root
ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)

$ sudo grep 'temporary password' /var/log/mysqld.log


Referencias:
[1] https://www.if-not-true-then-false.com/2010/install-mysql-on-fedora-centos-red-hat-rhel/

free VPN Service

vpnbook 2019 https://www.vpnbook.com/
  Username: vpnbook
  Password: rktbz9c


vpnbook (http://www.vpnbook.com/)
  Username: vpnbook
  Password: adv7ebeh
  .ovpn files  http://www.vpnbook.com/free-openvpn-account/VPNBook.com-OpenVPN-Euro1.zip

getusvpn (http://www.getusvpn.com/)

Notes:
After download OpenVPN Cliente on W7, run link (desktop) as Administrator.


References:

[1]  top 5 http://www.zeropaid.com/news/94826/top-5-free-vpn-services/
[2] http://www.tuvpn.com/es/tutoriales/openvpn-en-windows7#step-0
[3] Setting openvpn - ES https://hide.me/es/vpnsetup/ubuntu/openvpn/

Planes Internet Perú

Movistar
www.movistar.com.pe/negocio/internet-seguridad/internet-empresarial
www.movistar.com.pe/hogar/internet/solo-internet

Claro
www.claro.com.pe/negocios/fijos/adicionales/direcciones-ip-publicas/

Linux Fedora: Información de Hardware

En Windows, basta con instalar Everst, pero en Linux debemos seguir los siguientes pasos:

Paso 1: #yum install lshw lshw-gui

Paso 1: #yum install lshw lshw-gtk


Paso 2: #lshw


Otra forma es compilando desde el código fuente, asi :

Paso 1:#wget http://ezix.org/software/files/lshw-B.02.12.01.tar.gz
Paso 2:#tar -xvfz lshw-release.tar.gz
Paso 3:#cd lshw-B.02.12.01/src
Paso 4:#make
Paso 5:#lshw

make gui , para instalar interfaz gráfica


CONSTRUIR RPM package:

#rpmbuild -ta lshw-release.tar.gz
#rpmbuild -ta --with gui lshw-release.tar.gz

Linux Mono C#

$mono-csc searchmono.cs /out:seachmono -r:/usr/lib/mono/4.5/System.Web.dll

Compiling with mySql connector library
$mono-csc mysqlmono.cs /out:mysqlmono -r:System.Data.dll -r:/path/.nuget/packages/mysql.data/8.0.13/lib/net452/MySql.Data.dll


References:
[1] Example https://www.codeproject.com/Articles/9407/Introduction-to-Mono-Your-first-Mono-app
[2] Converter tools
     http://converter.telerik.com/
     https://codeconverter.icsharpcode.net/
     https://www.carlosag.net/tools/codetranslator/
[3] Mysql Connection https://www.mono-project.com/docs/database-access/providers/mysql/

Onde comprar no Brasil

Lojas online

[1] www.casasbahia.com.br
[2] www.extra.com.br
[3] www.americanas.com.br
[4] Notebook Accesories www.bringit.com.br
[5] www.kalunga.com.br
[6] Best Monitor prices than Notebook www.kabum.com.br
[7] Motos www.webmotors.com.br

Lojas remate
[1] www.saldaodainformatica.com.br

Ubuntu Services

sudo service --status-all


https://askubuntu.com/questions/912216/16-04-command-to-list-all-services-started-on-boot/912218

Linux small distro

Damn Small Project (bad)
Lubuntu 
Linux Lite (based on Ubuntu/Testing)
Tiny Core (Testing), works for Raspberry Pi
  Download:
  Installation GUI:
 

 $tce-load -wi Xvesa.tcz Xlibs.tcz Xprogs.tcz aterm.tcz flwm_topside.tcz wbar.tcz

 $tce-load -wi Xorg-7.7 #if Xvesa not found 

References:
[1] List of popular distros https://itsfoss.com/lightweight-linux-beginners/
[2] Comparison https://en.wikipedia.org/wiki/Light-weight_Linux_distribution
[3] Tiny Core installation https://iotbytes.wordpress.com/install-microcore-tiny-linux-on-local-disk/
[4] Tiny Core Packages http://distro.ibiblio.org/tinycorelinux/7.x/x86/tcz/
[5] Tiny Core Addin desktop http://wiki.tinycorelinux.net/wiki:adding_a_desktop_to_microcore
[6] WBar http://lxlinux.com/wbar.html

Ancho de Banda / Bandwidth Meter

Referencias
[1] www.speedtest.net
[2] http://openspeedtest.com
[3] https://www.meter.net

Ubuntu 16 - Setting PDF Printer

List of printers installed
$ls /etc/cups/ppd

Manually
Device URI:cups-pdf:/

By Command Line (Partial tested)

lpadmin -h localhost -p cups-pdf -v cups-pdf:/ -P /usr/share/cups/model/CUPS-PDF.ppd -E

Setting file (output/destination)
/etc/cups/cups-pdf.conf

Status Idle - File "/usr/lib/cups/backend/cups-pdf" has insecure permissions

$chmod 700 /usr/lib/cups/backend/cups-pdf

Null Printer
Device URI: file:/dev/null


References:
[1] Complete info https://en.opensuse.org/SDB:Printing_to_PDF

[2] openSUSE compile cups-pdf and ppd file https://pawn.physik.uni-wuerzburg.de/~vrbehr/cups-pdf/documentation.shtml
[3] CUPS PDF-WRITER Backend on Suse https://www.novell.com/coolsolutions/feature/17636.html

[4] Fake printer https://superuser.com/questions/304670/how-to-add-a-fake-dummy-null-printer-in-cups
[5] Install cups-pdf http://www.debianadmin.com/howto-install-and-customize-cups-pdf-in-debian.html

Fedora 29 Network Settings

References:
[1] https://alchemist.digital/articles/configure-a-static-ip-address-on-fedora-24-25/

Fedora 29 firewalld settings

$sudo service firewalld start 

$sudo firewall-cmd --list-all

$sudo firewall-cmd --get-zones

$sudo sudo firewall-cmd --zone=home --list-all

$sudo firewall-cmd --get-default-zone

$sudo firewall-cmd --get-active-zones

$sudo firewall-cmd --add-port=8081/tcp --permanent 
$sudo firewall-cmd --add-port=8081/udp --permanent 

$sudo firewall-cmd --reload  #important in Fedora 23 (VPS)
 
 
 
References:
[1] firewall-cmd https://docs.fedoraproject.org/en-US/Fedora/19/html/Security_Guide/sec-Open_Ports_in_the_firewall-CLI.html
[2] other firewall-cmd https://www.hiroom2.com/2017/07/12/fedora-26-firewalld-en/
[3] zones https://www.digitalocean.com/community/tutorials/how-to-set-up-a-firewall-using-firewalld-on-centos-7

Fedora - mySQL restoring root

ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)

#service mysqld stop // id doesn't stop run #mysqladmin -u root -p shutdown

#mysqld_safe --skip-grant-tables &

#mysql -u root 

> use mysql;

> update user set password=PASSWORD("mynewpassword") where User='root';

> flush privileges;

> quit

#service mysqld stop 

#service mysqld start &

if mysqld_safe not exist (updated 2019)
# systemctl stop mysqld
# systemctl set-environment MYSQLD_OPTS="--skip-grant-tables"
# systemctl start mysqld
$ mysql -u root
get temporaly password (updated 2019)

$sudo grep 'temporary password' /var/log/mysqld.log

A temporary password is generated for root@localhost: cvcvcv 

$mysql -u root -p 

mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'MyNewPass4!'; 

https://dev.mysql.com/doc/refman/8.0/en/linux-installation-yum-repo.html
reference:
http://www.rackspace.com/knowledge_center/article/mysql-resetting-a-lost-mysql-root-password

Ubuntu 18 add Samba

References:
[1] https://websiteforstudents.com/samba-setup-on-ubuntu-16-04-17-10-18-04-with-windows-systems/

Monitor network bandwidth on Linux server

References:
[1] https://www.binarytides.com/linux-commands-monitor-network/

Ubuntu Memory type ddr2 ddr3

$ sudo dmidecode --type 17

$ sudo lshw -short -C memory
 
From [1]

DDR1: 2.5 V, 133–200 MHz
DDR2: 200–400 MHz
DDR3: 1.5 V, 400–800 MHz (up to 1400 MHz for super-high-end)
DDR4: 1.2 V, 2133–4266 MHz

For example: if shows up in lshw -short -C memory as simply 16GiB DIMM Synchronous 2133 MHz (0.5 ns). The MHz rating indicates that it's almost certainly DDR4.

References:
[1] memory types http://en.wikipedia.org/wiki/Synchronous_dynamic_random-access_memory#Generations_of_SDRAM
[2]

Ubuntu upgrade from i386 to x86_64

https://askubuntu.com/questions/5018/is-it-possible-to-upgrade-from-a-32bit-to-a-64bit-installation

Mono ASP.NET MVC

References
[1] http://www.developerslearnit.com/2016/11/build-master-details-crud-in-aspnet-mvc.html
[2] 

Search old pages, Archive of webpages

[1] https://web.archive.org
      for example compelligence.com
                          grpiaa.inf.pucp.edu.pe

Tensor resources

References:
 [1] Tensor decomposition https://www.slideshare.net/panisson/tensor-decomposition-with-python
 [2] Tensores (sp) http://bibing.us.es/proyectos/abreproy/12082/fichero/Cap%C3%ADtulo3.pdf

Ubuntu 16 OpenCV 2.4

Problems during compilation:

relocation R_X86_64_32 against `ff_a64_muxer' can not be used when making a shared object

Solution:
recompile ffmpeg-3.4.5 with(2018-11-29):
./configure --enable-nonfree --enable-pic --enable-shared

Download ffmpeg and build 3.4.5, 3.2.12 or 4.0 and try to compile opencv doesn't help, then

Final solution: disable ffmpeg
$cmake  -D WITH_CUDA=OFF -D WITH_FFMPEG=0 ..
$make

That compile opencv 2.4.x and 3.4.x



References:
[1] Error sys/videoio.h not found problem http://yutopapa.hatenadiary.com/entry/2017/06/08/173149

ASP.NET MVC Mono

Settings at 11/2018

.Net Framework 4.5.2 using project properties
Mysql.Data.Entity using NuGet(6.10.8)

Setup Web.config

<!--Added--> 
<configSections> <section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.2.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
</configSections> 
<connectionStrings> 
  <add name="ferredb" connectionString="server=127.0.0.1;Port=3306;Database=ferre;Uid=root;Pwd=Microsoft;" providerName="MySql.Data.MySqlClient"/> </connectionStrings> 
<!--Added--> 
<entityFramework> 
<providers> 
  <provider invariantName="MySql.Data.MySqlClient" type="MySql.Data.MySqlClient.MySqlProviderServices, MySql.Data.Entity.EF6, Version=6.10.8.0, Culture=neutral, PublicKeyToken=c5687fc88969c44d">
  </provider> 
</providers> 
</entityFramework> 
<!--Added--> 
<system.data> 
<DbProviderFactories> <remove invariant="MySql.Data.MySqlClient" /> <add name="MySQL Data Provider" invariant="MySql.Data.MySqlClient" description=".Net Framework Data Provider for MySQL" type="MySql.Data.MySqlClient.MySqlClientFactory, MySql.Data, Version=6.10.8.0, Culture=neutral, PublicKeyToken=c5687fc88969c44d"/> 
 </DbProviderFactories> 
</system.data>

Fix version of entry System.Web.Mvc.MvcWebRazorHostFactory at views/Web.config


Classes

//Ado
using System;
using System.Data.Entity;
using MySQLEntity.Models;

namespace MySQLEntity.Entity
{

public class MyDb : DbContext
{
public MyDb() : base("ferredb")
//public MyDb() : base(nameOrConnectionString: "ferredb")
{
}
public DbSet<Usuario> Usuarios { get; set; }
}

}

//Entity
using System;
//Added
using System.ComponentModel.DataAnnotations.Schema;
using System.ComponentModel.DataAnnotations;


namespace MySQLEntity.Models
{
        [Table("Users")]
        public class Usuario
        {
            [Key]
            public string usuario { get; set; }
            public string apenom  { get; set; }
        }

}



Controller Snippet code

public ActionResult Index()
{
  MyDb db = new MyDb();
  var Model=db.Usuarios.ToList();
  return View(Model);
}
View Snippet code

@foreach (var item in Model)
{

<div> @item.usuario @item.apenom </div>

}

Action results

References:
[1] MySQL EntityFramework web.config https://iyalovoi.wordpress.com/2015/04/06/entity-framework-with-mysql-on-mac-os/
[2] Action results
https://www.c-sharpcorner.com/article/different-types-of-action-results-in-asp-net-mvc/
[3] ViewBag better than DataView http://www.tutorialsteacher.com/mvc/viewbag-in-asp.net-mvc

mySQL Develop Optimization

Select * from MOVPRO where fecmov>='2018-11-25' and tipmov='S'
EXPLAIN Select * from MOVPRO where fecmov>='2018-11-25' and tipmov='S'

CREATE INDEX MOVPRO_fecmov_tipmov_index ON MOVPRO (fecmov,tipmov)


References:
[1] faster using indexes https://blog.nodeswat.com/making-slow-queries-fast-with-composite-indexes-in-mysql-eb452a8d6e46

python3 using mysql connection

$pip3 install mysql-connector-python --user

from mysql.connector import (connection)


cnx=connection.MySQLConnection(user='user', password='*******',
             host='ip', database='db')

cnx.close()


Resources:
[1] https://dev.mysql.com/doc/connector-python/en/connector-python-installation.html

API Testing

References
[1] postman https://steelkiwi.com/blog/api-testing-useful-tools-postman-tutorial-and-hints/

Water Simulation

Compiling Sources:
[1] 2D SPH https://github.com/tizian/SPH-Water-Simulation
    $sudo apt-cache search sfml
    $sudo apt-get install libsfml-dev
    #change for's
    $make
    $./sph

[2] WebGL water simulation https://experiments.withgoogle.com/webgl-water-simulation

[3] Google webgl https://experiments.withgoogle.com/search?q=fluid
  [3.1] http://david.li/fluid/
  [3.2] http://madebyevan.com/webgl-water/
[4] 3D Simulation/Animation/Fluids and more https://www.fetchcfd.com/search-projects/type/cfd

Related:
[1] Stanford su2 https://su2code.github.io/
[2] Multiple Interacting Fluids https://www.yiningkarlli.com/projects/multifluid.html

São Carlos to Guarulhos

1) Expensive alternative

São Carlos - SP to Rodoviária Tietê, São Paulo - SP  66.53R
https://passagemcometa.com.br

São Carlos - SP to Rodoviária Tietê, São Paulo - SP  66.55R
http://www.empresacruz.com.br

São Paulo - Tietê - SP to Aeroporto de Guarulhos      37.00R
http://www.airportbusservice.com.br/

2) Cheap alternative


São Carlos - SP to Campinas - SP                               40.53R
https://passagemcometa.com.br


São Carlos - SP to Campinas - SP                               40.55R
http://www.empresacruz.com.br

Campinas-SP to Aeroporto de Guarulhos-SP             42.75R
https://www.buscaonibus.com.br

English Tools

English test - Duolingo

[1] https://englishtest.duolingo.com/applicants

Lessons
  [1] https://webapps.towson.edu/ows/activepass.htm

e-Books
[1] http://www.kosstu.kz/static/uploads/library/gumanitar/english/g-e-91.pdf
     http://www.kosstu.kz/static/uploads/library/gumanitar/english/
[2] English Grammar In Use for Raymond Murphy. https://golammartoza.files.wordpress.com/2016/02/english-grammar-in-use-intermediate001.pdf


Online grammar
[1] http://www.gingersoftware.com/grammarcheck
[2] http://www.grammarcheck.net/editor/

Aditional helps

[1] https://www.websiteplanet.com/blog/talking-aloud-talking-allowed-watch-write-make-sure-right/

[2] For Presentation
  [2.1] Presentation Skills for Scientists

Physics resources

Physic Courses
[1] Cursos de Graduação em Engenharia do ITA http://www.ief.ita.br/~rrpela/

Foreings guide - Guia para extranjeros - Brasil

References:
[1] En http://portal.mj.gov.br/EstrangeiroWEB/guia_eng.pdf
[2] Sp http://portal.mj.gov.br/EstrangeiroWEB/guia_esp.pdf

Filtering

References:
[1] http://cattedraledigitale.isti.cnr.it
      2012 Bilateral filters https://onlinelibrary.wiley.com/doi/full/10.1111/j.1467-8659.2011.02078.x

[2] http://files.is.tue.mpg.de/pgehler/assets/publications/jampani16learning/jampani16learning.pdf
[3] https://zapdf.com/fast-high-dimensional-filtering-using-clustering.html


[6] http://www.inf.ufrgs.br/~oliveira/students_dissertations/PhD/Eduardo_Gastal_PhD_Dissertation.pdf
[7] https://is.tuebingen.mpg.de/uploads_file/attachment/attachment/259/0766_cameraready.pdf
[8] http://www.scitepress.org/Papers/2016/57151/57151.pdf
[9] http://vision.ai.illinois.edu/publications/yangijcv2015.pdf
http://openaccess.thecvf.com/content_cvpr_2018/papers/Wu_Fast_End-to-End_Trainable_CVPR_2018_paper.pdf
http://perso.ensta-paristech.fr/~manzaner/Publis/icpr10.pdf
http://www.cs.cityu.edu.hk/~rynson/papers/tcsvt16a.pdf
https://arxiv.org/pdf/1505.00077.pdf
https://fukushima.web.nitech.ac.jp/paper/2016_visapp_fujita.pdf
http://www.riken.jp/brict/Yoshizawa/Papers/cgf09yby.pdf

High-dimensional integration without Markov chains, Alexander gray
https://www.cs.ubc.ca/~nando/nipsfast/slides/high.pdf

Fast edge-preserving/-aware high dimensional filters for image & video processing https://www.slideshare.net/yuhuang/fast-edge-preservingaware-high-dimensional-filters-for-image-video-processing

 

Aditional
[1] Parallel methods for Numeric Analysis http://adl.stanford.edu/cme342/Home.html
[2] Fast Multipole Methods https://www.math.uci.edu/~chenlong/MathPKU/FMMsimple.pdf

Resources
[1] ImageStack https://code.google.com/archive/p/imagestack/
                          https://github.com/abadams/imagestack
[2] RGBD Utils, use ImageStack https://github.com/s-gupta/rgbdutils

[3] Recursive bilateral filtering  https://github.com/ufoym/RecursiveBF
    ./rbf girl_out.bmp girl.bmp 0.1 0.04
    file https://media.macphun.com/img/uploads/uploads/macphun/noiseless/nl_slider_1_b.jpg
[4] Bilateral grid http://groups.csail.mit.edu/graphics/bilagrid/
[5] Bilateral upsampling http://people.csail.mit.edu/jiawen/

Python tools
[1] ndimage 3D convolution https://docs.scipy.org/doc/scipy-0.16.0/reference/ndimage.html

video face fake

Resources:
[1] Original article (pt) https://medium.com/ensina-ai/deep-fakes-ao-vivo-que-tal-entrar-em-uma-video-confer%C3%AAncia-com-o-rosto-de-outra-pessoa-92fc8c2d5726

[2] source code using docker https://github.com/alew3/faceit_live

opengl compile error

Compiling Collisions, quadtrees, uniform grid.

https://github.com/MarcusMathiassen/P2D

$g++ Circle.cpp getTime64.cpp Process.cpp Utility.cpp Color.cpp      hwinfo.cpp Inputs.cpp Quadtree.cpp  Vec2.cpp Config.cpp main.cpp Rect.cpp FixedGrid.cpp Node.cpp Render.cpp -I ../include/  -lGL -lglut -lGLU -lGLEW -lpthread -lX11 -lglfw  -o q5


error while loading shared libraries: libGLEW.so.2.1: cannot open shared object file: No such file or directory

$sudo apt-get install libglew-dev
$locate libGLEW.so.2.1
...
/usr/lib64/libGLEW.so.2.1.0
/usr/local/lib/libGLEW.so.2.1
/usr/local/lib/libGLEW.so.2.1.0
...
...

sudo vi /etc/ld.so.conf.d/glew.conf
/usr/local/lib

$sudo ldconfig

Resources:
[1] https://sourceforge.net/projects/glew/files/glew/snapshots/

Delaunay Resources

Delaunay
[1] http://www.cs.uu.nl/docs/vakken/ga/slides9alt.pdf
[1.1] Geometric Algorithms
       http://www.cs.uu.nl/docs/vakken/ga/


[2] Geometric modeling codes* http://jeffe.cs.illinois.edu/compgeom/code.html
[3] Hexahedral mesh https://www.hextreme.eu/download/
[4] Delaunay 3D https://github.com/ashwin/gDel3D
[5] Delaunay 3D https://github.com/ashwin/gStar4D
[6] Delaunay 2D/3D https://github.com/mikolalysenko/delaunay-triangulate
[7] D3D for C++ http://www.geom.at/fade3d/html/

C++ code visualizer

Resources:
[1] http://pythontutor.com/cpp.html, example https://goo.gl/JhKhnq

3D Models & tools

1) Open .obj 3D format

view3dscene
$sudo apt-get install view3dscene

meshlab - System for processing and editing triangular meshes
$sudo apt-get install meshlab

g3dviewer
$sudo apt-get install  g3dviewer

Other tools

1. glc_player which is said to read-and-show '.3ds', '.obj', '.stl', '.off', '.3dxml', and Collada ('.dae') files
2. g3dviewer which is said to read-and-show '.3ds', '.lwo', '.obj', '.dxf', '.md2', '.md3', '.wrl', '.vrml', '.dae' (COLLADA), '.ase' (ASCII Scene Exporter), '.ac' (AC3D)
3. ivview which reads-and-shows '.iv' and VRML1 files
4. paraview which reads-and-shows '.ply' and '.vt*' files
5. varicad-view which reads-and-shows '.dwg' (2D), '.dxf' (2D only?), '.igs' (maybe?), '.stp' (3D) files 
6. wings3d - Nendo-inspired 3D polygon mesh modeller (legacy)
7. gmsh - Three-dimensional finite element mesh generator
8. libadmesh-dev - Tool for processing triangulated solid meshes.
9. libgmsh-dev - Three-dimensional finite element mesh generator.
10. libmadlib-dev - mesh adaptation library
11. libnglib-dev - Automatic 3d tetrahedral mesh generator development files
12. libscotch-dev - programs and libraries for graph, mesh and hypergraph partitioning
13. netgen - Automatic 3d tetrahedral mesh generator
14. libtriangle-dev - High-quality 2-D mesh generator development files

Resources
 [1] mview http://mview.sourceforge.net/

Models
  [1] .max, .obj, blender, etc. www.turbosquid.com
  [1] http://tf3dm.com/

Python extending functions from C/C++

References
[1] https://docs.python.org/3/library/ctypes.html

https://cython.readthedocs.io/en/latest/src/tutorial/cython_tutorial.html
https://opensourceforu.com/2010/05/extending-python-via-shared-libraries/
https://en.wikibooks.org/wiki/Python_Programming/Extending_with_C%2B%2B

Linear Regresion

[1] Regresion linear http://onlinestatbook.com/2/regression/intro.html
[2] https://towardsdatascience.com/linear-regression-with-example-8daf6205bd49

Z Stack Resources

Resources
[1] Head images   http://bids.neuroimaging.io/

pip3 ImportError: cannot import name 'main'

In linux you need to change the file: /usr/bin/pip3 from:

from pip import main
if __name__ == '__main__':
    sys.exit(main())

to:

from pip import __main__
if __name__ == '__main__':
    sys.exit(__main__._main())

 

 

c++ realloc references

https://en.cppreference.com/w/c/memory/realloc
https://www.tutorialspoint.com/c_standard_library/c_function_realloc.htm

quadtree

References:
[1] http://www.lcad.icmc.usp.br/~jbatista/procimg/quadtree_neighbours.pdf
[2] http://homepage.divms.uiowa.edu/~kvaradar/sp2012/daa/ann.pdf
[3] http://web.archive.org/web/20120907211934/http://ww1.ucmss.com/books/LFS/CSREA2006/MSV4517.pdf
[3] operations cost https://arxiv.org/pdf/1712.05591.pdf
Resources:

[1] quadtree neighbors https://bl.ocks.org/mbostock/4343214
[2] neighbors https://gist.github.com/patricksurry/6478178
[3] neighbors https://github.com/geidav/quadtree-neighbor-finding/blob/master/neighbors.py
[4] https://geidav.wordpress.com/2017/12/02/advanced-octrees-4-finding-neighbor-nodes/
[5] for check https://github.com/xoolive/quadtree

[6] gaussian kd-tree https://www.cg.tuwien.ac.at/courses/Visualisierung2/HallOfFame/2012/7-Labschuetz/Homepage/index.html#References
[7] quadtree over CUDA source code http://ecee.colorado.edu/~siewerts/extra/code/example_code_archive/a490dmis_code/CUDA/cuda_work/samples/Samples.html

Linux: mount folder to different folders

Code:

mount -o bind /media/disk1/pictures /home/user1/pictures
mount -o bind /media/disk1/pictures /home/user2/pictures

for add a fstab entry to auto-mount at startup.

Code:

/media/disk1/pictures /home/add1cker/pictures none defaults,bind 0 0

OpenGL Tutorial

 Common libs for start

$sudo apt-get install freeglut3-dev

Matrix Class [3]

Error:
_dl_check_map_versions: Assertion `needed != ((void *)0)' failed!

Fixed using -lpthread parameter [2].


References:


[1] https://www.opengl.org/wiki/Programming_OpenGL_in_Linux:_GLX_and_Xlib

[2]  http://stackoverflow.com/questions/20007961/error-running-a-compiled-c-file-uses-opengl-error-inconsistency-detected
[3] http://www.songho.ca/opengl/index.html
     http://www.songho.ca/opengl/gl_matrix.html#example1
[4] Image Libraries
      https://www.opengl.org/wiki/Image_Libraries
[5] SFML
      http://www.sfml-dev.org/tutorials/2.3/start-linux.php

git commands

References:
[1] https://git-scm.com/book/en/v2/Git-Branching-Basic-Branching-and-Merging

Raspberry pi 3

1) user and passwords:

Distribution   | Username   | Password
---------------|------------|-------------
Debian Squeeze | pi         | raspberry
Arch           | root       | root
QtonPi         | root       | rootme
Raspbian       | pi         | raspberry
OpenElec       | root       | openelec
Pidora         | root       | raspberrypi
RISC OS        | n/a        | n/a
raspbmc        | pi         | raspberry

2) add users

$sudo adduser username

$usermod -aG sudo username

3) Ports

$lsof -nP -i | grep LISTEN
$netstat -tlpn | grep LISTEN
 

4) vncserver (reinstall, by default sometime doesn't works)

$sudo apt-get install tightvncserver 

5) Firewalls

iptables -I INPUT -p tcp --dport 5900 -j ACCEPT
iptables -I INPUT -p tcp --dport 5901 -j ACCEPT

Resources:

[1] https://www.digitalocean.com/community/tutorials/how-to-create-a-sudo-user-on-ubuntu-quickstart

[2] direct way https://www.shellhacks.com/how-to-grant-root-access-user-root-privileges-linux/

[3] vncserver https://quaintproject.wordpress.com/2013/03/24/establish-a-vnc-connection-to-your-raspberry-pi-from-a-linux-pc/

smoothing

References:

[1] smoothing python https://matthew-brett.github.io/teaching/smoothing_intro.html

Optimize code C/C++

If you are using linux: use getchar_unlocked() and putchar_unlocked() for taking fast single character I/O.
In Windows the equivalent is getchar() and puchar() repectively


Resources:
[1] fast input/output https://ideone.com/BrsDz4


Enteprise solutions:
[1] http://www.fastformat.org/

Computational Resources

Resources:
[1] Computational Biophysics Software http://www.ks.uiuc.edu/Research/vmd/vmd-1.9.1/

Programming online C++ and others

Online programming tools

Resources:
[1] C++, Python  https://repl.it/@melhorum


[2] Multi Language Support https://code.dcoder.tech/

[3] Account for C/C++, C#, Java  http://rextester.com
[4] http://www.onlinegdb.com/

Store on EEUU for Buy

Stores:
[1] https://www.shipito.com/pt/shipito-pricing

Python 2.7 pip

Resolving error on python 2.7 using pip: ImportError: No module named _internal

$wget https://pypi.python.org/packages/e7/a8/7556133689add8d1a54c0b14aeff0acb03c64707ce100ecd53934da1aa13/pip-8.1.2.tar.gz
$tar -xzvf pip-8.1.2.tar.gz
$cd pip-8.1.2
$sudo python setup.py install

Lectures

https://arxiv.org/pdf/1803.04189.pdf

OpenCV 2.4.9 and 3.4.1 Compiling

2.4.x

CUDA_nppi_LIBRARY  CUDA 7.5 -> 8.0 (was removed)
  -D WITH_CUDA=OFF ..

c++ 6 fatal error: stdlib.h: No such file or directory

 export CC=path_of_gcc/gcc-version
 export CXX=path_of_g++/g++-version
 cmake  path_of_project_contain_CMakeList.txt
 make 

OR

 #Current version is 6, but we need to compile using another version (installed for sure)

$CC="gcc-4.9" CXX="g++-4.9" cmake /CMakeLists.txt 

OR$cmake -G "Unix Makefiles" -DCMAKE_CXX_COMPILER=/usr/bin/g++ CMAKE_C_COMPILER=/usr/bin/gcc -DCMAKE_BUILD_TYPE=RELEASE -DCMAKE_INSTALL_PREFIX=/usr/local -DWITH_TBB=ON -DBUILD_NEW_PYTHON_SUPPORT=ON -DWITH_V4L=ON -DINSTALL_C_EXAMPLES=ON -DINSTALL_PYTHON_EXAMPLES=ON -DBUILD_EXAMPLES=ON -DWITH_QT=ON -DWITH_OPENGL=ON -DBUILD_FAT_JAVA_LIB=ON -DINSTALL_TO_MANGLED_PATHS=ON -DINSTALL_CREATE_DISTRIB=ON -DINSTALL_TESTS=ON -DENABLE_FAST_MATH=ON -DWITH_IMAGEIO=ON -DBUILD_SHARED_LIBS=OFF -DWITH_GSTREAMER=ON -DWITH_OPENMP=OFF -DWITH_CUDA=OFF -DBUILD_opencv_gpu=OFF ..

3.4.x

Unknown CMake command "ocv_append_source_files_cxx_compiler_options".

This happened when the opencv_contrib version is no compatible with your current version.

cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local -D WITH_TBB=ON -D BUILD_NEW_PYTHON_SUPPORT=ON -D WITH_V4L=ON -D INSTALL_C_EXAMPLES=ON -D INSTALL_PYTHON_EXAMPLES=ON -D BUILD_EXAMPLES=ON -D WITH_QT=ON -D WITH_OPENGL=ON -D OPENCV_EXTRA_MODULES_PATH=../../opencv_contrib/modules/ ..


$make
$sudo make install
$sudo ldconfig

After installation, if doesn't compile, check the files opencv.conf and opencv.pc:
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
#/etc/ld.so.conf.d/opencv.conf
/usr/local/lib
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
#/usr/local/lib/pkgconfig/opencv.pc

prefix=/usr/local
exec_prefix=${prefix}
libdir=${exec_prefix}/lib
includedir_old=${prefix}/include/opencv
includedir_new=${prefix}/include

Name: OpenCV
Description: Open Source Computer Vision Library
Version: 2.4.13.6
Libs: -L${exec_prefix}/lib -lopencv_contrib -lopencv_legacy -lopencv_stitching -lopencv_nonfree -lopencv_superres -lopencv_ocl -lopencv_objdetect -lopencv_ml -lopencv_ts -lopencv_videostab -lopencv_video -lopencv_photo -lopencv_calib3d -lopencv_features2d -lopencv_highgui -lopencv_imgproc -lopencv_flann -lopencv_core -L/usr/lib/x86_64-linux-gnu -lIlmThread -lHalf -lIex -lIlmImf -lImath -ljasper -ltiff -lpng -ljpeg -lavutil -lswscale -lswresample -lavcodec -lz -llzma -lxcb-shape -lxcb-render -lxcb-xfixes -lxcb-shm -lxcb -lavformat -lv4l2 -lv4l1 -ldc1394 -lGL -lGLU -latomic -ltbb -lrt -lpthread -lm -ldl -lstdc++
Cflags: -I${includedir_old} -I${includedir_new}

 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -


Resources:

[1] opencv github (choice right branch) https://github.com/opencv/opencv

[1] opencv_contrib is just from 3.0 .. https://github.com/opencv/opencv_contrib/releases
[2] Steps for install () http://karytech.blogspot.com/2012/05/opencv-24-on-ubuntu-1204.html
[3] Script for install under ubuntu16 https://gist.github.com/fortunto2/20a9696c7fc23ef18f8cfc50e371fe5f
[4] Some variables http://daveaubin.com/index.php/how-to-build-and-install-opencv-2-4-9-on-raspberry-pi/

Signal Processing - Sound Processing

 Resources:
[1] Course and Tutorial https://github.com/AllenDowney/ThinkDSP

Fluid Simulation: Lectures and Resources

CAELinux LiveDVD in your computer to turn it into a free and open engineering development workstation with CAD, CAM, CAE / FEA / CFD, electronic design and 3D printing  features: no licence and even no installation is required ! [2]


Resources:
[1] Laboratory http://lgg.epfl.ch/research_physicsbased_animation.php
[2] CFD Linux distro https://caelinux.com/CMS3/

Courses:
[1] Khan https://pt.khanacademy.org/partner-content/pixar/effects/particle/p/water-simulation

Compiling tris2indicator on Linux Ubuntu 16

change code from MapViewOfFile (Windows) to mmap (Linux) on read_obj.cpp and write_grid.cpp.

$g++ read_obj.cpp vect.cpp global.cpp insert_poly.cpp write_grid.cpp timer.cpp main.cpp -lpthread -lm -o tris2indicator



source code:
[1] http://josiahmanson.com/research/wavelet_rasterization/

Mapping files into memory

• CreateFile(); or OpenFile();
• CreateFileMapping();
• MapViewOfFile();
  

mmap() combines the functions of CreateFileMapping() and MapViewOfFile()

References
[1] https://stackoverflow.com/questions/8391094/equivalent-win-api-in-nix
[2] http://pubs.opengroup.org/onlinepubs/9699919799/functions/mmap.html
[3] mmap example https://gist.github.com/marcetcheverry/991042

AI Courses and Resources

Resources:

 [1] Berkeley course http://ai.berkeley.edu
 [2] Minimax algorithm https://www.geeksforgeeks.org/minimax-algorithm-in-game-theory-set-3-tic-tac-toe-ai-finding-optimal-move/
 [3] Alfa Beta Prunning https://www.geeksforgeeks.org/minimax-algorithm-in-game-theory-set-4-alpha-beta-pruning/

 [4] Full Course, Search slides https://courses.cs.washington.edu/courses/cse473/14au/slides/

Qt Project to MakeFile

qmake -spec macx-g++ x.pro on Mac OS X to generate Makefile
qmake x.pro on linux to generate Makefile (default behaviour)
qmake -spec win32-g++ x.pro on Windows to generate Makefile

References:
[1] https://stackoverflow.com/questions/8571687/how-to-get-a-makefile-from-qmake

Fluid SImulaton Source codes

Compile OceanSurface under Ubuntu 16 [2]
* Install dependences
libglm-dev
libglfw3-dev
libsoil-dev

$g++ -o OceanSurface main.cpp wave.cpp Record.cpp -lGL -lglfw -lGLEW -lfftw3 -lfftw3f -lSOIL


Resources:
[1] splishsplash http://melhorum.blogspot.com.br/2018/05/compile-splishsplash.html
[2] https://github.com/JiashuoLi/OceanSurface
[3] https://ttnghia.github.io/

Ubuntu 16 Setting Screen Samsung SyncMaster T240M

$cvt 1600 1000 #get right values for this resolution
$gtf 1600 1000 60 #alternative


# 1600x1000 59.87 Hz (CVT 1.60MA) hsync: 62.15 kHz; pclk: 132.25 MHz
Modeline "1600x1000_60.00" 132.25 1600 1696 1864 2128 1000 1003 1009 1038 -hsync +vsync
 
$ sudo xrandr --newmode "1600x1000" 132.25 1600 1696 1864 2128 1000 1003 1009 1038 -hsync +vsync  #define

$ sudo xrandr --addmode DVI-I-1 "1600x1000" #register on system

$ xrandr
Screen 0: minimum 320 x 200, current 1600 x 900, maximum 16384 x 16384
DVI-I-1 connected primary 1600x900+0+0 (normal left inverted right x axis y axis) 518mm x 324mm
1920x1200 59.95 +
1600x1200 60.00
1280x1024 75.02 60.02
1280x960 60.00
1152x864 75.00
1024x768 75.08 70.07 60.00
832x624 74.55
800x600 72.19 75.00 60.32 56.25
640x480 75.00 72.81 66.67 60.00
720x400 70.08
1600x900 59.95*
1600x1000 59.87
DVI-I-2 disconnected (normal left inverted right x axis y axis)
HDMI-1 disconnected (normal left inverted right x axis y axis)
1600x900_60.00 (0x58e) 118.250MHz -HSync +VSync
h: width 1600 start 1696 end 1856 total 2112 skew 0 clock 55.99KHz
v: height 900 start 903 end 908 total 934 clock 59.95Hz

* Set permanent settings using ~/.xprofile (for example)
$vi ~/.xprofile
#
xrandr --newmode "1600x1000" 132.25 1600 1696 1864 2128 1000 1003 1009 1038 -hsync +vsync 
xrandr --addmode DVI-I-1 "1600x1000"


* Problem: After nvidia drivers installation this doesn't works (crap)



$xrandr --fb 1600x1000 #show
xrandr: specified screen 1900x1000 not large enough for output DVI-I-3 (1920x1200+0+0)
xrandr: Configure crtc 0 failed
X Error of failed request:  BadValue (integer parameter out of range for operation)
#or
X Error of failed request:  BadMatch (invalid parameter attributes)

$xrandr --output DVI-I-3 --scale 1x0.85  #this solve  after nvidia drivers installation



References:
http://ubuntuhandbook.org/index.php/2017/04/custom-screen-resolution-ubuntu-desktop/

ARM Virtual Machine resources

[1] https://www.red-lang.org/2012/03/setting-up-arm-virtual-machine.html

Nvidia and Opengl doesn't works

libGL error: No matching fbConfigs or visuals found
libGL error: failed to load driver: swrast

Prepare removing

• sudo apt-get purge nvidia* #This will remove your current nVidia drivers
• sudo apt-get install --reinstall xserver-xorg-video-intel libgl1-mesa-glx libgl1-mesa-dri xserver-xorg-core
• sudo dpkg-reconfigure xserver-xorg #This should fix Xorg
• sudo update-alternatives --remove gl_conf /usr/lib/nvidia-current/ld.so.conf

After this reïnstall nVidia software

• sudo apt-add-repository ppa:xorg-edgers/ppa #provides the necessary repository
• sudo apt-get update
• sudo apt-get install bumblebee-nvidia nvidia-319 nvidia-settings-319

voip by web

[1] 12voip https://www.12voip.com

My favorite Music

Ludwig Van Beethoven
   Symphony No. 5 in C minor ("Fate") (composed 1804–08, premièred 1808)
   Sonata N° 14 'moonlight'
   Fur Elisa
   Himno de la alegria
   Turkish March  (Adapted by Chavo del 8 program, in intro)


Wolfgang Amadeus Mozart
  Turkish March
  Réquiem

Antonio Vivaldi
  Storm
  La Stravaganza  Four Season:Spring

Johan Sebastian Bach
 Toccata and Fugue Ave maria
  Passacaglia
Frédéric Chopin
  Waltz rain
  Spring waltz (Mariage d'Amour)

Antonín Dvořák
  Symphony no. 9 - 4th movement - Allegro con fuoco

C++ equivalent to getch() and getche() from conio.h

#include <iostream>
#include <termios.h> //TCSANOW, ICANON, ..
#include <unistd.h>  //STDIN_FILENO ..
#include <stdio.h>  //getchar

using namespace std;

char getch(void)
{
  struct termios oldattr, newattr;
  char ch;
  tcgetattr( STDIN_FILENO, &oldattr );
  newattr = oldattr;
  newattr.c_lflag &= ~( ICANON | ECHO );
  tcsetattr( STDIN_FILENO, TCSANOW, &newattr );
  ch = getchar();
  tcsetattr( STDIN_FILENO, TCSANOW, &oldattr );
  return ch;
}

char getche(void) //with ECHO
{
  struct termios oldattr, newattr;
  int ch;
  tcgetattr( STDIN_FILENO, &oldattr );
  newattr = oldattr;
  newattr.c_lflag &= ~( ICANON );
  tcsetattr( STDIN_FILENO, TCSANOW, &newattr );
  ch = getchar();
  tcsetattr( STDIN_FILENO, TCSANOW, &oldattr );
  return ch;
}

int main(int argc,char *argv[])
{
  char ch1=getch();
  char ch2=getche();
  cout << "\nFirst : " << ch1
       << "\nSecond: " << ch2 << endl;
  return 0;
}
//g++ getchx.cpp -o getchx

References
[1] https://www.daniweb.com/programming/software-development/threads/410155/gcc-equivalent-for-getch

Alternatives to shazam

[1] On web https://www.midomi.com
[2] Get song name from mp3 on web  http://audiotag.info
[3] Chrome plugin https://www.aha-music.com/

Deep Learning Lectures

References:
[1] Top ten papers https://www.techleer.com/articles/517-a-list-of-top-10-deep-learning-papers-the-2018-edition/

Printable Grid and Rulers Paper

Resources:
[1] Graph Paper, ready for print over A4 http://www.grassfedjp.com/print-grid-paper/
[2] Rulers http://leversetdujour.info/ruler-to-print.html

Alternatives to Google StreeView

References:

[1] https://www.mapillary.com/
[2] https://www.topbestalternatives.com/google-street-view/

Linux Microphone doesn't working

Try to reload drivers

$sudo alsa force-reload

restart device and check if sound is workin? if it doesnt do this:

$sudo apt-get remove --purge alsa-base pulseaudio
$sudo apt-get install alsa-base pulseaudio 

References:
[1] https://askubuntu.com/questions/508221/sound-input-device-microphone-not-working

Fedora/CentOS Change ports of Apache Web Server (httpd)

1) In file /etc/httpd/conf/httpd.conf

Listen 80
Listen 8079

This till your server to listen to the port 8079

2) virtual host file  /etc/httpd/conf.d/vhost.conf

<VirtualHost *:8079>
 DocumentRoot /var/www/html/api_folder
 ServerName example.com
 ServerAlias www.example.com
 ServerAdmin root@example.com 
 ErrorLog logs/www.example.com-error_log
 CustomLog logs/www.example.com-access_log common
</VirtualHost>

This mean when you go to your www.example.com:8079 redirect to
/var/www/html/api_folder

3) Restart the service

$sudo service httpd restart
$systemctl restart httpd.service

references:
[1] https://httpd.apache.org/docs/2.4/bind.html

Call using Internet (Brasil - Perú)

https://www.poptox.com/Peru
https://www.spytox.com/whose-number-is-calling-me

Ubuntu 16 OpenCV 2.4.x disable ffmpeg and jpeg

cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local -D WITH_TBB=ON -D BUILD_NEW_PYTHON_SUPPORT=ON -D WITH_V4L=ON -D INSTALL_C_EXAMPLES=ON -D INSTALL_PYTHON_EXAMPLES=ON -D BUILD_EXAMPLES=ON -D WITH_QT=ON -D WITH_OPENGL=ON -D WITH_FFMPEG=OFF -D WITH_JPEG=OFF ..

Ubuntu webm to mp4

ffmpeg -i video.webm -movflags faststart -profile:v high -level 4.2 video.mp4

Ubuntu 16 VMWare Player


$wget -c https://download3.vmware.com/software/player/file/VMware-Player-12.5.0-4352439.x86_64.bundle
$sudo chmod u+x VMware-Player-12.5.0-4352439.x86_64.bundle
$sudo ./VMware-Player-12.5.0-4352439.x86_64.bundle

Ubuntu how to get interval time for run Application

howmuchdelay.sh

T="$(date +%s%N)"
# Do some work here
$1 $2 $3 $4 $5 #sleep 2

# Time interval in nanoseconds
T="$(($(date +%s%N)-T))"

# Seconds
S="$((T/1000000000))"

# Milliseconds
M="$((T/1000000))"

printf "Take: %02d:%02d:%02d:%02d.%03d\n" "$((S/86400))" "$((S/3600%24))" "$((S/60%60))" "$((S%60))" "${M}"

Learn Persian On Line

Resources:
[1] https://www.persianlanguageonline.com/learn/beginner/hello/
[2] http://www.persiandee.com/view/showLesson/currentLesson/1
[3] http://mylanguages.org/multimedia/farsi_audio_colors.php

Ubuntu 16: Arcade games

$sudo apt-get install zsnes  #super nintendo
$sudo apt-get install mupen64plus  #nintendo 64

Ubuntu CPU-G

Ubuntu 16

$sudo add-apt-repository ppa:atareao/atareao
$sudo apt-get update
$sudo apt-get install cpu-g


Ubuntu 14

sudo add-apt-repository ppa:cpug-devs/ppa
sudo apt-get update
sudo apt-get install cpu-g

Ubuntu 16 Using QEmu

Basic Commands:

*create drives 

$qemu-img create name.img size|M|G

$qemu-img create win98hda.img 400M 

*resize driver

$qemu-img resize filename [+|-]size[K|M|G|T]

$qemu-img resize win98hda.img +600M

$gparted win98hda.img #for expand physically 

$qemu [-boot ] -cdrom .iso [-m size]|128M -hda disk-name.img

$qemu -boot d -cdrom win98se.iso -m 512 -hda win98hda.img

other examples:

[1] install win98 using boot iso and installer iso (two disks)

$qemu-system-i386 -hda win98s2018.img -boot d -cdrom win98boot.iso -drive file=win98se.iso,index=3,media=cdrom

$qemu-system-i386 -hda win98s2018.img -boot c -cdrom win98boot.iso -drive file=win98se.iso,index=3,media=cdrom 

$qemu-system-i386 -drive file=win98s2018.img,format=raw -m 512 #other way to run

$qemu-system-x86_64 -hda driveubuntu.img -cdrom ubuntu-x86-14.1-r1.iso -boot d -m 1024   -usbdevice mouse



Images:
[1] Windows XP https://mega.nz/#!B4ZEiRyD!tIS4NFNqcShJtTvNcheujIfSVS8H3ejlU2VLJdN9C3o
[2] 95 https://mega.nz/#!tw4m2Z6K!XsrXdAODy0HGjNVzvpSNviDQfvQP0ULVI7UGbhFdJh0

References:
[1] https://www.unixmen.com/how-to-install-and-configure-qemu-in-ubuntu/
[2] http://www.helenos.org/wiki/UsersGuide/RunningInQEMU

Raspberry PI 3 qemu

apt-get install libglib2.0-dev zlib1g-dev

$./configure --target-list=i386-softmmu  #for reduce time > 5hrs (normally)


$make

$sudo make install

https://b3n7s.github.io/update/2016/06/08/windows-xp-on-qemu.html
https://wiki.gentoo.org/wiki/QEMU/Windows_guest

Ubuntu Dark Wallpaper

http://www.misucell.com/group/best-ubuntu-backgrounds/

Ubuntu - Deploy Mono ASP.NET MVC

$vi /etc/apache2/apache2.conf  #verify includes external config files
...
# Include module configuration:
IncludeOptional mods-enabled/*.load
IncludeOptional mods-enabled/*.conf
..
$sudo vi /etc/apache2/mods-enabled/mod_mono.conf  #add/verify content

<IfModule !mod_mono.c>
     LoadModule mono_module /usr/lib/apache2/modules/mod_mono.so</IfModule>
<IfModule mod_headers.c>
    Header set X-Powered-By "Mono"
</IfModule>

AddType application/x-asp-net .aspx
AddType application/x-asp-net .asmx
AddType application/x-asp-net .ashx
AddType application/x-asp-net .asax
AddType application/x-asp-net .ascx
AddType application/x-asp-net .soap
AddType application/x-asp-net .rem
AddType application/x-asp-net .axd
AddType application/x-asp-net .cs
AddType application/x-asp-net .vb
AddType application/x-asp-net .master
AddType application/x-asp-net .sitemap
AddType application/x-asp-net .resources
AddType application/x-asp-net .skin
AddType application/x-asp-net .browser
AddType application/x-asp-net .webinfo
AddType application/x-asp-net .resx
AddType application/x-asp-net .licx
AddType application/x-asp-net .csproj
AddType application/x-asp-net .vbproj
AddType application/x-asp-net .config
AddType application/x-asp-net .Config
AddType application/x-asp-net .dll
DirectoryIndex index.aspx
DirectoryIndex Default.aspx
DirectoryIndex default.aspx


May be you will get apache2: Syntax error on line 141 of /etc/apache2/apache2.conf: Syntax error on line 8 of /etc/apache2/mods-enabled/mod_mono.conf, then reinstall mono module for apache.


verify path, using :


$locate mod_mono.so

or reinstall module 

$sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF
$echo "deb http://download.mono-project.com/repo/ubuntu stable-xenial main" | sudo tee /etc/apt/sources.list.d/mono-official-stable.list
$sudo apt-get update

$sudo apt-get install mono-devel

$sudo apt install libapache2-mod-mono 

References:

https://github.com/edgarrc/MonoUbuntu/blob/master/install.sh
[2] mod_mono.conf https://github.com/mono/mod_mono/blob/master/mod_mono.conf.in
[3] for update mono module repository http://www.mono-project.com/download/stable/

html css menu

References:
[1] http://css-snippets.com/drop-down-navigation/
[2] http://inspirationalpixels.com/tutorials/creating-a-dropdown-menu-with-html-css
[3] simple https://www.w3schools.com/howto/howto_css_dropdown.asp

Ubuntu 16, enable ASP.NET templates on MonoDevelop

$sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF  
$echo "deb http://download.mono-project.com/repo/debian alpha main" | sudo tee /etc/apt/sources.list.d/mono-xamarin.list  
$sudo apt-get update 

$sudo apt-get install mono-devel mono-complete ca-certificates-mono mono-xsp4 #take time

$sudo apt-get install monodevelop=5.10.0.871-0xamarin2 #[1]

May be you will get this message at create project:Access to the path “/etc/mono/registry” is denied, then 

$sudo mkdir /etc/mono/registry

$sudo chmod uog+rw /etc/mono/registry

References:
[1] https://askubuntu.com/questions/770299/monodevelop-on-xubuntu-missing-asp-net

Ubuntu Radio

I) Install application

$sudo apt install radiotray python-xdg

II) Setting radio
1) Perú - Radio Planeta
https://17953.live.streamtheworld.com/CRP_PLAAAC.aac?csegid=1010&tdsdk=js-2.9&lat=-16.4&long=-71.5&pname=TDSdk&pversion=2.9&banners=300x250%2C728x90&sbmid=d3f8db5f-71cf-4c05-8764-bfbdf3857e4e
III) Radio Peró (online) http://www.emisoraperuana.com


References:
[1] http://www.webupd8.org/2017/02/5-cool-internet-radio-players-for-linux.html

Ubuntu VB6 Application + mySQL

$winetricks corefonts eufonts lucida opensymbol tahoma cjkfonts 

$winetricks vb6run

$winetricks mdac28

$winetricks msxml4 mfc42 jet40 native_oleaut32

$winecfg #set libraries for overwrite

odbccp32
odbc32
oleaut32

$wine msiexec /i mysql-connector-odbc-5.1.13-win32.msi #choice best driver

$wine control 

references:

http://www.sanitarium.co.za/how-to-get-wine-windows-mysql-connectorodbc-and-ubuntu-13-10-to-all-be-friends/

[2]  Launch icon https://askubuntu.com/questions/21823/how-to-create-a-shortcut-to-start-a-windows-application-with-wine

Bolsas Brasil

1) capes https://scba.capes.gov.br  cpf + senha

Ubuntu moodle pre-requisites

$sudo ufw app list

$sudo apt-get install libapache2-mod-php
$sudo apt-get install php7.0-curl 
$sudo apt-get install php7.0-zip

$sudo chmod 777 /var/www/ -R

$sudo apt-get install php7.0-mysql
$sudo apt-get install php7.0-xml



$sudo apt-get install php7.0-gd


$sudo apt-get install php7.0-intl

$sudo apt-get install php7.0-xmlrpc
$sudo apt-get install php7.0-mbstring

Ubuntu Hard Drive Health Monitor

HDD Verification tool

$sudo apt-get install smartmontools
$sudo apt-get install gsmartcontrol

$sudo smartctl --all /dev/sda

Ubuntu 14 Lamp

https://www.godaddy.com/help/build-a-lamp-stack-linux-apache-mysql-php-ubuntu-14-17341
https://www.howtoforge.com/ubuntu-lamp-server-with-apache2-php5-mysql-on-14.04-lts
https://styde.net/como-instalar-lamp-en-ubuntu-linux/
https://www.digitalocean.com/community/tutorials/como-instalar-linux-apache-mysql-php-lamp-en-ubuntu-14-04-es
https://www.digitalocean.com/community/tutorials/how-to-install-lamp-on-ubuntu-14-04-quickstart

Update kernel to the latest mainline version without any Distro-upgrade?

To find out which kernel you have type uname -rin terminal.Now type this command to get list of available kernels.

apt-cache search linux-image

this will give you a very big output.Now chose one of them that you want to install and install it by following commands(Don't type these commands like this,replace the word kernal_version with the kernel version which you wish to install)

sudo apt-get install linux-image-kernal_version
sudo apt-get install linux-image-extra-kernal_version
sudo apt-get install linux-headers-kernal_version

Now in my case i choose linux-image-4.10.0-22-generic so my command will look like this

sudo apt-get install linux-image-4.10.0-22-generic 
sudo apt-get install linux-image-extra-4.10.0-22-generic
sudo apt-get install linux-headers-4.10.0-22-generic

now in the end remove old kernel by command

sudo apt-get autoremove

sudo reboot

Related to Certificates

Generate a CSR
https://www.digitalocean.com/community/questions/how-do-i-generate-a-csr-key

Create the self-signed certificate
https://help.ubuntu.com/lts/serverguide/certificates-and-security.html

Create thrid certificate using CSR
https://ssl.comodo.com/free-ssl-certificate.php
https://support.comodo.com/index.php?/comodo/Knowledgebase/Article/View/637/66/

Aditional information
https://www.ssl2buy.com/ssl-certificate-google-rankings
https://www.elegantthemes.com/blog/tips-tricks/how-to-get-a-free-ssl-certificate-and-why-google-is-forcing-you-to